4-nitrosodiphenylamine derivatives and their use as coupling agents for filled rubber compounds

A composition of matter is disclosed that comprises a compound of the formula A_nR, wherein:

• A is ##STR1##
• R₁ is hydrocarbyl;
• m is 0 or 1;
• n is 1, 2, or 3;
• R is selected from the group consisting of:

  mono-, di-, and trivalent aliphatic groups; mono-, di-, and trivalent aromatic groups; five- and six-membered heterocyclic rings comprising n carbon atoms bonded to A, at least one nitrogen atom, and, optionally, at least one sulfur atom; and ##STR2##

  wherein R₂ and R₃ are independently selected from the group consisting of hydrogen and hydrocarbyl. These compounds are useful as coupling agents in filled elastomer compositions.